A couple of weeks ago, my wife Sharon and I were out for a long neighborhood walk. This is not unusual for us, but on this particular day we took a route we hadn’t walked in quite some time. I was pleased to notice that one of the traditional, colonial-style houses we encountered was sporting solar panels on its roof. And then we noticed another. And another. And yet more, so many that we lost count. Not every house, certainly, but enough in this particular section of northwest D.C. to make a strong impression.

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